When you see "gdi16.hdi (Software)" in your settings, it means Hardware Acceleration is disabled . Instead of using DirectX to communicate with your GPU, AutoCAD is using your CPU to emulate graphics rendering via the Windows Graphics Device Interface (GDI). Why Is AutoCAD Using gdi16.hdi Instead of My GPU?
Several factors can force AutoCAD into this "Safe Mode" or software rendering state: autocad virtual device gdi16.hdi
If you are using AutoCAD 2023 or newer and your GPU is struggling, forcing a downgrade to DirectX 11 often fixes the gdi16.hdi error. When you see "gdi16